N-COUNT An atoll is a ring of coral rock, or a group of coral islands surrounding a lagoon. 环形珊瑚岛
The Tuamotu Archipelago is part of French Polynesia, and forms the largest chain of atolls in the world.
土阿莫土群岛隶属于法属波利尼西亚，是世界上最大的环礁岛群。
Atafu is just five miles wide and is the smallest of three atolls in the Tokelau Islands, a New Zealand territory.
Atafu仅有5英里宽，是托克劳群岛的三个环礁中最小的一个，领土属于新西兰。
The eclipse drew an arc across the open sea and uninhabited atolls, making its main landfall on remote Easter Island.
日食在开阔的海域和无人居住的环礁划出一条弧线，日落则在偏远的复活节岛。
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